Downgauging is a term used to describe processes or use new methods to reduce the totality of material in a package, such as lighter materials or decrease wall thickness. Packaging form, for example, how bees produce honey in cubes forms in such a way as the structure of the walls makes each wall stronger yet take less space geometrically. It makes it possible to ship more units in less space; it reduces transportation cost, less fuel.
Or use biomimicry design how the product itself integrate packaging as a part natural (eggs and Bananas are examples). Refilling systems where consumers bring back the empty package to refill are inexpensive. See Bagasse, Green packaging , Flatpack and Downcycle